Exhibit 23.a CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-87573 and 333-29433) of Old National Bancorp of our report dated January 26, 2000 relating to the financial statements, which appears in the Annual Report to Shareholders, which is incorporated in this Annual Report on Form 10-K. /s/ PricewaterhouseCoopers LLP Chicago, Illinois January 26, 2000